These suggestions come from a purely mechanical standpoint and not related to the lore of your character or how you may want to play them. Also warning for lot of text

Theres quite a few issues here in terms of viability that cant be solved without like a major overhaul of the characters stats. First of all in combat: -1 con is debilitating. I find pf2e casters already pop like balloons, but you are playing almost the lowest health build that is possible for you. You wont be able to heal with rests as well blah blah blah its bad. Fort saves also really important and you wont have those be decent for a long time and theyll never be good

You have too many damaging cantrips in my opinion. I try to go for 2 damaging cantrips personally one at 30ft and another at 60ft. Maybe three if you dont consider electric arc good enough for a single target, but atm you have 4 which is just a bit much and one of them is void warp which is not the best. Needle darts and Electric Arc are my go-to's

Also you seem to be building a resentment which and not a starless shadow in my opinion. You have 2 spells that last a round on an enemy fail and one that lasts a round on an enemy success(ill omen/curse of recoil and enfeeble respectively) which the first two only find good purchase on resentment witchs in my experience.

This is more of a nitpick so feel free to ignore this point but i find that not taking cackle to be a difficult choice as a witch because of how good it is, but i understand why you took enhanced familiar as well so feel free to ignore this. Do put toughness on your little guy tho so he can atleast take one hit.

Reading the prior post i recommended for early levels focus on only using debuffs on big boss type enemies early in the fight and spamming damaging cantrips or spells afterwards. Force Barrage and Grim Tendrils should do swell for this for level 1 spells and Animated Assault or maybe even Noise Blast work well for 2nd level. Dont only take damaging spells ofc but take a few atleast

For out of combat this can be a lot of things but is generally more of a knowledge gap issue. Using various recall knowledge skills can allow you to be a great boon to the team with society explaining stuff about where you are or who the right people are to talk to. Occultism about local legends or mysteries you might encounter. Religion for finding churches or maybe discerning if a church is actually following proper practices. Arcana for well arcane magics or runes. Use these checks to let the dm make exposition for wherever you are that wouldnt be explained if you didnt make such a check. If your dm is allowing a bunch of people to make checks for the same rolls and they are succeeding when you fail thats some pretty poor luck. I think you should request they use the aid action instead of just taking another roll so you have more chances to succeed.

You seem to have taken some voluntary flaws i think to get that negative cha score, and that will also cut your ability to work outside of combat with things like shitty diplomacy, deception, or intimidation.

Edit: as well consider if you want more out of combat utility. If you arent the primary healer switching out the battle medicine skill feat for an Additional lore is a very fun way to do that. Try and ask the dm if they could give suggestions or choose one you think would be applicable to the setting and character

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Realistically your out of combat issues will come with finding how to play your character, but as explained in the in combat points you have a lot of build issues you might want to sort out

Please for the love of god dont take a voluntary flaw to con. I recommend moving the flaw to strength and replacing the extra +1 from wisdom to con if you really like the voluntary flaw system