First - thank you for improving the global tree by working on Suggestions. I appreciate when another member is able to work on and improve profiles I haven't touched in awhile.
In general, I do not think it would be appropriate to contact a profile manager that is currently active but has not been actively working on the profile you happened to run across with suggestions.
Think about exactly what would be the purpose of your contact before you send a private message or leave a comment on a profile.
Will your message or comment be constructive or collaborative? If yes, then go ahead and send it.
Keep in mind, everyone has different levels of time, commitment, interest, and abilities and any of these may change over time due to unexpected circumstances.
For instance, when I had more time to commit to WikiTree and genealogy in general, I adopted a number of problem profiles for various reasons. Currently, I do not have lots of hours each week available to me to devote to resolving all of the suggestions or even review and improve all of the profiles on my watchlist. I am slowly working through the various suggestions, but it will take time. I am sure there are others that are having the same difficulty.