ive been thinking about ur question since uve posted it and tbh there's no set answer for u (from me).
to be honest in every game ive played ive been a serial resetter, so im all for resetting, but i have to take a look at it from ur perspective but i dont know what ur perspective is!!! u feel attached to ur island yet bored of it, but what exactly are u bored of? are u bored of having all these items? r u bored of the monotony? r u bored of how u decorated ur island? r u bored of getting all the things u wanted so quickly/easily?
if ur just bored how u decorated ur island, then u could easily redecorate and reterraform it. u could completely obliterate everything and just do it all in one fell swoop or u could take ur time and do it piece by piece, but either way id highly recommend moving literally all ur movable buildings to the beach or as close to it as u can. redecorating would help with monotony as well, because if ur just logging on to say hi to ur villagers atm now u can log on to say hi and also remove all their yards.
if u cannot stand that u have an orange indicating ur native fruit on ur passport, or u just despise the green airport then i think that an island reset would be the only thing to soothe ur irritations. in fact, the first time i reset is because i had a yellow airport and my resident services was too close to my airport. the second time is bc the island name sucked and i had taken a 2 month break from it so i had no idea what my plans were anymore. but these annoyances cannot be fixed so easily save for the blissful touch of a delete all game save data.
if ur bored maybe u could try to collect literally everything in the game. every color variation of an item, every fossil, art piece, etc. heck, even every villager. even tho we dont have the new leaf tree, u can still keep track of which villagers u get thru the pictures/posters, but ig if u just scan in any amiibo cards u have u dont technically have to get the villager, unless villager pictures appear in the catalog but are unorderable. in which case yes, collect every villager. complete ur catalog, u dont have to reset ur island for it!! u could even challenge urself to not buy out the whole store every day to make completing ur catalog completion take longer.
i definitely hear the sentiments of my fellow acnh players whomst have said that resetting once may plunge u down into the hole of resetting, and theyre telling the truth!! ive literally reset twice now, but since im more stress-free and have seen all the possibilities that creativity can have (which wasnt rly there @ the launch of the game) im much more confident in this island. but im still not immune to temptation now, even if i have my apples and orange airport.
so if ur willing to learn for ur "mistakes" &/or have wants that cannot be achieved in ur current game then id say tip the scale a bit more in favor of resetting and then start ruminating on ur choices again. good luck my friend.
edit:
@Baroque brought up a good point about having ur friends keep ur bells and stuff, but if ur problem is that u have everything u want and thats boring then i wouldnt do that and would just start from the ground up.