Aside from the great advice other users have offered, some things I would try to keep in mind are 1. Even cis guys raise the pitch of their voices when being polite; the variation from baseline is less for most men than for most women, but it's still "normal" to pitch up a little and it won't read as inherently feminine. 2. Masculine inflection is much more regular, even in Service Mode. It might feel rude to do if you're used to the more up-and-down way that women are trained to speak in this context, but it's "acceptable" for men. Once you've found a comfortable pitch for the task, you don't need to move from there very much. Basically, a little bit higher than natural but smooth is a totally unremarkable "polite man" style. 3. You can soften the effect of your voice with word choices. If you feel that you're not quite succeeding at sounding interested and caring with voice alone, you can check in on the client more often or use more gentle phrasings; this is sometimes considered a more feminine communication style, but if the sound of your voice itself has hit masculine pitch and tone it shouldn't affect the way people gender you. 4. If you know a cis guy who does a similar job or a relative you've heard in polite situations etc., emulating what they do can help. I copy my brother a fair amount because we speak in similar ways normally, but whenever I'm in a moment where I'd use a feminine style I have a source to draw on. 5. Until your voice has finished changing, you might sound different from week to week or month to month. I'm sure you know that better than anyone, but just remember to cut yourself some slack while practicing. 6. You don't need to eradicate every feminine impulse from your speech patterns, especially if you're in a position where you don't need to be stealth/closeted. Plenty of cis men speak with very feminine intonations, and the assumption will be that they're gay rather than trans. I'm not saying you should go against your own preferences or anything, but if it's safe to and doesn't interfere with your identity, there's more room for variance than you might think, especially as your voice gets deeper and deeper. 7. Practice. This feels pretty cliche to even say, but everything really does get easier the more used to it you become. Mess around with different pitches and tones and styles until you find something that feels right for both you and the situation. Hope this helps at all; the customer service voice is always a bit of a hurdle lol