The biggest gain I've seen at one time on my fico score was 23 points from getting a charged off account removed through a Goodwill letter. So getting negatives removed but other than that only thing that will net a big gain is if you pay down debt and have a huge drop in utilization.
Current 2023 FICO 8 score - 760 (EX) 758 (TU) 762 (EQ) (FICO 9s seem to be significantly higher)
Starting score - 530
Discover it - $4,200
Citi Custom Cash - $6,600
CFNA Firestone - $3,200
Amex BCE - $2,500
Mission Lane - $1,100
Chase slate (AU) - $3,000
Chase Freedom Flex - $11,100
Lowes Advantage card - $10,000
PNC poop points- $4,500
2 student loans 93% paid off
AMEX loan only 7% paid off so far
Total current Utilization among all accounts- 20%