Clean Podcast Audio File

Can you help? We have produced a few podcast episodes and the sound quality is not great. We really need to tidy it up. We have done a fair bit of editing of files so we are not keen to use the raw file . We have published the podcast but not yet promoted it so you can have a listen and let us know if you think you can help. We have 8 episodes to work with now and will have future recordings.

https://podcasts.apple.com/ie/podcast/tech-talks-powered-by-buildable-approvals-hosted-by/id6792936211

Note these are also available on youtube hence not wanting to split out the file.

Please advise turnaround time and budget ... thanks