Oracle Database Discussions

I am using Oracle 12.2.0.1.  My tablespaces appear to be too much fragmented and I would need to reclaim the free space at data file level.  How can I do it without using enterprise Manager (since I dont have it) or major manual steps?

I used following query -

SELECT

   ts.tablespace_name, "File Count",

   TRUNC("SIZE(MB)", 2) "Size(MB)",

   TRUNC(fr."FREE(MB)", 2) "Free(MB)",

   TRUNC("SIZE(MB)" - "FREE(MB)", 2) "Used(MB)",

   df."MAX_EXT" "Max Ext(MB)",

   (fr."FREE(MB)" / df."SIZE(MB)") * 100 "% Free",

   RPAD('*', TRUNC(CEIL((fr."FREE(MB)" / df."SIZE(MB)") * 100)/10), '*')    "Graph"

FROM

   (SELECT tablespace_name,

   SUM (bytes) / (1024 * 1024) "FREE(MB)"

   FROM dba_free_space

    GROUP BY tablespace_name) fr,

(SELECT tablespace_name, SUM(bytes) / (1024 * 1024) "SIZE(MB)", COUNT(*)

"File Count", SUM(maxbytes) / (1024 * 1024) "MAX_EXT"

FROM dba_data_files

GROUP BY tablespace_name) df,

(SELECT tablespace_name

FROM dba_tablespaces) ts

WHERE fr.tablespace_name = df.tablespace_name

AND fr.tablespace_name = ts.tablespace_name

ORDER BY "% Free" desc

/

and from results I can see that my APP_DATA has 76% free space. I would like to reclaim 181 GB physical disk space. How can I do it? Thanks