To improve RSRP of cellular devices, one could use external antennas that have a higher gain than factor-provided internal antennas.
RSSI includes power from all source including from co-channel service & non-serving cells, adjacent channel interference, thermal/flicker noise, etc. 
RSRQ provides information of the quality of the received reference signals including the contribution of interference, i.e., factors in RSSI (Received Signal Strength Indicator) and the number of resource blocks (N) used for the transmission. RSRP provides information about signal power from a specific cell while excluding noise and interference from other cells. The table below shows recommended RSRP (Reference Signal Received Power) and RSRQ (Reference Signal Received Quality) values for LTE signals. See more on 4G Bands and 5G Bands in use in the U.S. On the other hand, mmWave bands can exhibit lower interference because of the narrow wavelengths (narrow pencil-like beams in the order of several millimeters) and shorter range which reduces opportunities for encountering interfering signals. However, such lower bands can exhibit higher interference because of the wider coverage and longer wavelengths. 
For example, a low frequency band such as LTE/NR band 71 can help operators achieve wider coverage (because of lower pathloss exhibited by lower frequency signals). Additionally, different LTE/NR bands could exhibit different levels of interference. Interference is often worse at the cell-edge. There are different types of interference sources (and different naming) including: self-interference, multiple-access interference, inter-cell interference, intra-cell interference, co-channel interference (CCI), adjacent channel interference (ACI), etc.
Signal quality is primarily affected by interference. While most users of cellular devices understand that “signal strength” is important for good cellular signal reception, most folks do not realize that “signal quality” is by far a more determinant of the performance of 4G LTE and 5G NR cellular devices.
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