I have been waiting for Bitcoin to reach $3000 so that I can sell my Bitcoins, but seems as if it doesn't want to reach that value anytime soon. SHould I sell with the current amount? 
The safest, and in my opinion probably the smartest decision would be sell now.
If you bought in pre-halving then you would have quadrupled your investment or even more in some cases in a short timespan of a year. So even though you missed out on the ATH as an opportunity to sell, you're still getting a decent amount now.
I'd expect pre-UASF a week or so the price will drop dramatically as a result of people panic selling. So therefore, if you're in bitcoin for the long run, then you should sell now, and buy when the price dips down pre-1 August.
I have a feeling though that we'll see another pump, hopefully breaking $3000. There has been much sideways movements the past few days, probably meaning that we're retesting 3k.