[Aleksis]

Assalamualikum wr wb sanflone

i myself suffered simialrly from excessive wasasa and it effected my prayers, wudhu etc, and i'd say i'm about 95% cured now AlHamdulillah, so i'll tell you how i managed to deal with it and inshAllah that would help:

i learnt that being certain that all fardh wudhu areas are wet is not a neccessity; as long as one thinks that they are probably wet, then thats all thats needed, so we can ignore constant doubts from shaytan that this bit and that bit may still be dry etc,; the same goes for gusl as well; it is based on probability and not certainty

also what helps me with wudhu is, when i feel that the shaytan might give me a bit of a hard time... when it comes to the feets, i just fill up a bowl/bucket; enough for my feets to be all wet upto the ankles, so with one dip each with the feets, i can be sure there all wetted properly!

what helps me too when i take a bath is, take a dip in the bath water, i.e, submerge my back part of body and then front part, so once all the parts of my body ahs been submerged, i can be sure that no parts are left dry; a kick in the shaytans stomach!

when it comes to prayer, the recitation does not have to be precise or that one's salaah will be invalidated; infact common mistakes such as saying the swadh like the seen etc are accepeted, so as long as you've tried your best, dont worry about it too much as it is Allah the most mercifull who is to accept our salaah; obviously we should try to make the recitation proper, but common mistakes should not be considered as a nullifying factor for the salaah; read a fatwa saying just that in sunnipath.com; thus now i am able to, at least most of the time, read my salaah in one go without having to break it time and time again

regarding other types of wasasa that comes through, we should ignore all of that to the best of our abilty and just get on with our worship for as long as we dont dwell on the wasasa or let it spoil our getting on with the worship, the wasasa cannot harm us; i have read from a great Alim [mufti taqi usmani [ra]] that shaytan even will try to put in bad thoughts directed at Allah [swt], but that the way to deal with it is to ignore it and not let it bother us, for it is only natural for the shaytan to try and distract us from worship, thus whatever the wasasa, the way forward is to ignore it

hope this helps
salaam

ps: i also identified that it was bad sinfull habits i had that basically did not make the wasasa abate, thus AlHamdulillah working on getting rid of the bad habits helped too; now i can concentrate much more and do wudhu and salaah almost totally normally just like anyone else rather than get distracted by wasasa and forget wether i washed this bit and that and how many rakaahs i prayed etc.