If you have an odd ability score, you increase the following by +1:
- Saving Throws
- STR, DEX or substitute (like the druid’s Shillelagh spell): Weapon Damage
- DEX: Initiative
- CON: Bonus due Hit Die/Dice healing
- INT, WIS, CHA: Spell Attack Modifier
- When (for some reason) your ability score/modifier is halved, round up
If you think it’s not enough, you can even go further, like:
- CON: +1 hit point/2 levels
- +1 to proficiency skills (since you simply know about them more and can utilize the even tiniest improvement better)
- no +1 to spell attacks if you cast a cantrip