Sold my games, convince my action, right or wrong

Alright, i bought ezio trilogy, iii remastered, black flag, and rogue.

I played until brotherhood, and then i give up. Respectively, brotherhood stopped me halfway, the game requirements for full sync just irritated me.

Skill issue? I agree, also, probably me being so "rushing" to catch up the series. I bought those games one by one with the idea of wanting to get involved in the series, i like the series, i like the idea of historical setting, but trying to have a full completion stopped me. Should i not care about the full completion? Despite how some installment "sucks" like those rpgs, i still wanna play them, but yeah. I kinda regret with my decision, kinda not idk. I might buy them again but idk if the same thing would happen. Would love to hear any helps, suggestions, tips, anything really. I'm so so bad at this lol.