MySQL Migration & Performance Fix

I'm seeking an expert to migrate my MySQL server from CentOS 6.9 to AlmaLinux 9. Currently, I'm experiencing very poor server performance, particularly slow queries across the board. I've made some minor tweaks, but that hasn't improved the situation.

Key requirements:
- Migrate MySQL server to AlmaLinux 9
- Resolve performance issues, especially slow queries
- Optimize MySQL settings for better performance

Ideal skills:
- Expertise in MySQL and Linux server administration
- Proven experience with performance tuning and optimization
- Familiarity with CentOS and AlmaLinux

Please provide examples of similar work done.