As hard as this is to do, it’s good advice that I myself should take whenever the time comes.
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…I always run my own tracks through someone else for the final touch. Simply because that person can still listen to the track objectively and fresh…
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…Firstly, if it were me I would have them properly mastered - even though I mix and master myself, I find I cannot master my own mixes as I am too close to the project & tend to revert back to multitracks & redo the mix rather than simply let it go & get on with it. Maybe it is just me but I honestly cannot find the objectivity to deal with my own work…
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The reason I say it’s hard, is because I’m involved in all aspects of the recording - from the initial song writing to arranging it, playing all the instruments and laying down the vocals.
Them trying and deciding on which VSTs to use, if any etc.
Finally mixing the whole thing down, only to hand it over to someone else.
Because by then, it’s ‘my baby’ and yet it’s like I’m handing it over to Family [Social] Services who supposedly will do better for it than I will. 
And yet sometimes it just must be done.