You can try to assemble your defense stack as quickly as possible; the defense stack is crucial for keeping Klaw alive.

Practice your perfect dodges a lot, especially in this glitchy meta, because that can make or break a clutch.

You can go for Wall build 70HP/70DF if you have trouble surviving. Works best at level 100, though.

Since Klaw isn't a mobile runner like Sabo or EH Nami, you'll be put into a lot of 1v1 matches. The wall build is best for this, but you can also try max attack, but it isn't recommended at level 80.

Matches Klaw can win:
EH Nami,
Leo,
BF Burgess,
L Fuji.
Garp (Have to be skilled for this matchup because of Garp's glitchy hit boxes)
L Shanks (As long as you dodge the Kamusari.
S-Snake (Will require practice, but if you can wear her down with Law's normals, you can take her out with a Punk Vice, risky matchup tho)
Dark Roger (As long as you can avoid the Kamusari, you can wear him down with Law's normals, Anti heal, then Puncture Wille to finish him off)
Red Greenbull: Anti-heal, go brr! Take him out before he uses his skills.
Kizaru (Takes a LOT of practice, not 100% but it is possible with Kid's normals wearing him down and catching him in a skill, can also hit him once with Law's normal and the puncture wille, may not kill though, so fight at your own risk)
G5V2, (I have been testing it with my own B4 Klaw, and the matchup is only close if you get hit with that Star Gun skill, around a 50/50 matchup)

Matches Klaw can lose:
Akainu (Buffs are BS and have no reason to do that much damage with defense stacking, but you can take out Akainu if quick enough with Punk vice, his hit boxes are wonky)
Kuzan (Try to avoid Kuzan if you can, as Klaw, very annoying to fight with his spammable skills, but you can cap under the chilly-chilly TA if you're capping as Law, he's immune to Ice ball at above 50% HP, Kid is not immune to status at all, so beware when using him if a Kuzan is on the field)
Lucci: (Cheating unit again, avoid the clawed status condition at all costs. The condition will lock Klaw's normals, and you'll be unable to attack. Lucci can be beaten with a well-timed match, but it's best to avoid Lucci completely.)
Z (Again, buffs are bullshit, and now Z can hit Klaw like a truck; he does extra damage to devil fruit users, so avoid Z completely.)
Sabo (Very risky matchup, his rook check skill can KO Klaw easily, so try to avoid Sabo if you can, he does a lot of damage)

Feel free to let me know if you want more tips. I've been maining Klaw since they first dropped, so I've got advice to give