Suggest any under the radar coins which will go big soon.
My suggestion is XRD, Radix
I will make two suggestions for you, the first is to go the the list of the top rated cryptocurrencies on coinmarketcap and select any of you choice, secondly, if you can make research on any of the available new crypto projects introduced, you can have an investment on any you find is more convincing to take your risk ion their investment, but first consider the risk involved on making investment on new projects, some may be successful and some may not.
I second your opinion as it would be more secure to go with the top crypto coins which reduces the risk factor as atleast one might not be losing huge amount but it might not have the potential to give 100x profits or even 10x profits. I would say the news coins may profit the kind of profit you are expecting but only few of them will succeed. We need to ensure we don't end up buying any random coins due to FOMO like some of us do during bullrun. I would say lets stick to basics and prepare an strategy for occasionally short term investment in new coins with stop loss in place.