Restarting Meditation

I am a long time tm meditator/Siddha who fell out of my habit of twice a day meditation following a divorce about ten years ago — for the last ten years it has been a few times a week, but not consistent…i found some of your guided meditations on YouTube and have used them as a vehicle to return to my practice…I am slowly approaching my meditation goal of twice a day (though I am not there yet)  plus yoga…I am wondering how primordial sound technique differs from mantra meditation…also I am wondering (as I am still on my second mantra technique (TM) if you also teach more mantras for those who have been meditating since the early seventies)…I read somewhere that we are supposed to upgrade

according to our age.   Advice on how to make my meditation a regular practice again is also my question…I miss how it used to feel…